ניהול קשרים
חלק זה יציג כיצד למצוא ולהוסיף קשר מ-DHT לקלינט. השימוש בשוררת שמות לא יוסבר כאן. אם אתה רוצה פרטים נוספים על זה, אנא קרא שם פרוטוקול השרת.
נוכחות ברשת
הודיע על נוכחותו ב-DHT
נוכחות היא די פשוט להודיע על DHT. למעשה, זה רק ערך המכיל את ההש של המכשיר (ראה את החלק הקודם, הניהול חשבון) על ההש המתאים לאצבע האצבע של המפתח. אז, אם יש לנו את החשבון bf5f1e21d3eb2c1246946aa49d5dcf3e5b9cb1b9 עם המכשיר 62fbdff0ce86f368c7d3c2682539e5ba9e06404f, הערך המוגדר הבא יישלח על DHT:
/**
* Device announcement stored on DHT.
*/
struct DeviceAnnouncement : public dht::SignedValue<DeviceAnnouncement>
{
private:
using BaseClass = dht::SignedValue<DeviceAnnouncement>;
public:
static const constexpr dht::ValueType& TYPE = dht::ValueType::USER_DATA;
dht::InfoHash dev;
std::shared_ptr<dht::crypto::PublicKey> pk;
MSGPACK_DEFINE_MAP(dev, pk)
};
(ערך זה יכול להיות מופיע עם dht_.put(h, VALUE, dht::DoneCallback{}, {}, true);, כמשקם קבוע). אם המכשיר מודיע, המכשיר נמצא. לעת עתה, אין דרך למחוק או לערוך ערך על DHT (זה יגיע כאשר OpenDHT תמוך ECC). כך, הנוכחות תמיד יש עיכוב לעת עתה (התאמה ממוצעת: expiry-time/2, אז 2min30 לעת עתה).
תגידי אם יש קשר.
Now our presence on the network, it’s time to get if somebody is present on the DHT. With the previous section, it’s easy to do the reverse process. To know if somebody is present on the DHT (ex: bf5f1e21d3eb2c1246946aa49d5dcf3e5b9cb1b9), we have to get value at bf5f1e21d3eb2c1246946aa49d5dcf3e5b9cb1b9 and retrieve the DeviceAnnouncement on this hash. The related code in the daemon is in jamiaccount.cpp:
auto shared = std::static_pointer_cast<RingAccount>(shared_from_this());
auto treatedDevices = std::make_shared<std::set<dht::InfoHash>>();
dht_.get<dht::crypto::RevocationList>(to, [to](dht::crypto::RevocationList&& crl){
tls::CertificateStore::instance().pinRevocationList(to.toString(), std::move(crl));
return true;
});
dht_.get<DeviceAnnouncement>(to, [shared,to,treatedDevices,op](DeviceAnnouncement&& dev) {
if (dev.from != to)
return true;
if (treatedDevices->emplace(dev.dev).second)
op(shared, dev.dev);
return true;
}, [=](bool /*ok*/){
{
std::lock_guard<std::recursive_mutex> lock(shared->buddyInfoMtx);
auto buddy_info_it = shared->trackedBuddies_.find(to);
if (buddy_info_it != shared->trackedBuddies_.end()) {
if (not treatedDevices->empty()) {
for (auto& device_id : *treatedDevices)
shared->onTrackedBuddyOnline(buddy_info_it, device_id);
} else
shared->onTrackedBuddyOffline(buddy_info_it);
}
}
RING_DBG("[Account %s] found %lu devices for %s",
getAccountID().c_str(), treatedDevices->size(), to.to_c_str());
if (end) end(shared, not treatedDevices->empty());
});
וזהו הכל.
Client perspective
<method name="subscribeBuddy" tp:name-for-bindings="subscribeBuddy">
<tp:docstring>
Ask be be notified when 'uri' presence change
</tp:docstring>
<tp:added version="1.3.0"/>
<arg type="s" name="accountID" direction="in">
<tp:docstring>
An account from which get request presence informations
</tp:docstring>
</arg>
<arg type="s" name="uri" direction="in">
<tp:docstring>
A SIP uri to watch
</tp:docstring>
</arg>
<arg type="b" name="flag" direction="in">
<tp:docstring>
</tp:docstring>
</arg>
</method>
<signal name="newBuddyNotification" tp:name-for-bindings="newBuddyNotification">
<tp:added version="1.3.0"/>
<tp:docstring>
Notify when a registered presence uri presence informations changes
</tp:docstring>
<arg type="s" name="accountID">
<tp:docstring>
The associated account
</tp:docstring>
</arg>
<arg type="s" name="buddyUri">
<tp:docstring>
The registered URI
</tp:docstring>
</arg>
<arg type="i" name="status">
<tp:docstring>
Is the URI present or not
</tp:docstring>
</arg>
<arg type="s" name="lineStatus">
<tp:docstring>
A string containing informations from the user (human readable)
</tp:docstring>
</arg>
</signal>
<method name="publish" tp:name-for-bindings="publish">
<tp:added version="1.3.0"/>
<arg type="s" name="accountID" direction="in">
<tp:docstring>
The account from which the presence will be emitted
</tp:docstring>
</arg>
<arg type="b" name="status" direction="in">
<tp:docstring>
Is this account present or not
</tp:docstring>
</arg>
<arg type="s" name="note" direction="in">
<tp:docstring>
A message transmitted by the server to other users
</tp:docstring>
</arg>
</method>
Are the main APIs for clients. subscribeBuddy will listen on the DHT to detect presence changes and newBuddyNotification will be sent whenever a new status is detected:
The status sent to the client is now 0=offline (no device found on the DHT), 1=dht_presence (at least a device is found on the DHT), 2=connected (with a TCP + SIP channel, so ready to exchange data).
lineStatuswill contain any custom status sent by the peer (e.g. Lunch Time!)
publish is used for publishing a custom note (status is ignored for Jami accounts, note will contain the custom status).
RFC3863 is used to send status over the SIP connection.
בקשה מתבצעת
שלח בקשה
הבקשה של כלי-הפנייה של TODO
לבסוף, ברגע שהבקשה של אמון מתבצעת, אנחנו יכולים לדחוף את הבקשה ל-hash הבא: InfoHash("inbox:" + deviceId)
הקוד הבא משמש בדיימון:
dht_.putEncrypted(dht::InfoHash::get("inbox:"+dev.toString()), dev, dht::TrustRequest(DHT_TYPE_NS, payload));
קבלת בקשה
תודה
(קבל/בלוק/רחיק)
API של דיימון
כל השיטות לעקוב אחר נוכחות חבר נמצאות ב- PresenceManager כגון:
<signal name="newBuddyNotification" tp:name-for-bindings="newBuddyNotification">
<tp:added version="1.3.0"/>
<tp:docstring>
Notify when a registered presence uri presence informations changes
</tp:docstring>
<arg type="s" name="accountID">
<tp:docstring>
The associated account
</tp:docstring>
</arg>
<arg type="s" name="buddyUri">
<tp:docstring>
The registered URI
</tp:docstring>
</arg>
<arg type="b" name="status">
<tp:docstring>
Is the URI present or not
</tp:docstring>
</arg>
<arg type="s" name="lineStatus">
<tp:docstring>
A string containing informations from the user (human readable)
</tp:docstring>
</arg>
</signal>
כל השיטות והסיגנולים המשמשים לניהול בקשות אמון וקשרי קשר נמצאים ב- ConfigurationManager כגון:
<method name="getTrustRequests" tp:name-for-bindings="getTrustRequests">
<tp:added version="2.2.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<annotation name="org.qtproject.QtDBus.QtTypeName.Out0" value="VectorMapStringString"/>
<arg type="aa{ss}" name="requests" direction="out" >
<tp:docstring>
A list of contact request details. Details:
- from: account ID of sender
- received: UNIX timestamp of reception date
- payload: attached payload
</tp:docstring>
</arg>
</method>
<method name="acceptTrustRequest" tp:name-for-bindings="acceptTrustRequest">
<tp:added version="2.2.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="from" direction="in">
</arg>
<arg type="b" name="success" direction="out" tp:type="Boolean">
<tp:docstring>
True if the operation succeeded.
</tp:docstring>
</arg>
</method>
<method name="discardTrustRequest" tp:name-for-bindings="discardTrustRequest">
<tp:added version="2.2.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="from" direction="in">
</arg>
<arg type="b" name="success" direction="out" tp:type="Boolean">
<tp:docstring>
True if the operation succeeded.
</tp:docstring>
</arg>
</method>
<signal name="incomingTrustRequest" tp:name-for-bindings="incomingTrustRequest">
<tp:added version="2.2.0"/>
<tp:docstring>
Notify clients that a new contact request has been received.
</tp:docstring>
<arg type="s" name="accountID">
</arg>
<arg type="s" name="from">
</arg>
<arg type="ay" name="payload">
</arg>
<arg type="t" name="receiveTime">
</arg>
</signal>
<method name="sendTrustRequest" tp:name-for-bindings="sendTrustRequest">
<tp:added version="2.2.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="to" direction="in">
</arg>
<arg type="ay" name="payload" direction="in">
</arg>
</method>
<method name="addContact" tp:name-for-bindings="addContact">
<tp:added version="3.0.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="uri" direction="in">
</arg>
</method>
<method name="removeContact" tp:name-for-bindings="removeContact">
<tp:added version="3.0.0"/>
<arg type="s" name="accountID" direction="in">
</arg>
<arg type="s" name="uri" direction="in">
</arg>
<arg type="b" name="ban" direction="in" tp:type="Boolean">
<tp:docstring>
True if the the contact should be banned.
If false, the contact is removed from the contact list (banned or not).
</tp:docstring>
</arg>
</method>
אם אתה רוצה כמה דוגמאות, השיטות הללו משמשות ב- contactmodel.cpp ב- LRC.